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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2011
Fair Value of Financial Instruments [Abstract]  
Fair Value of Financial Instruments
Note 12 — Fair Value of Financial Instruments
 
Amounts reflected in our consolidated balance sheets as of June 30, 2011 for cash and cash equivalents approximate fair value. The fair value of our revolving credit facility has been estimated based on similar debt transactions that occurred during the six months ended June 30, 2011. Estimates of the fair value of our Senior Notes are based on market information as of June 30, 2011. A summary of the fair value and carrying value of the financial instruments is shown in the table below.
 
                                 
    June 30, 2011     December 31, 2010  
    Carrying Value     Estimated Fair Value     Carrying Value     Estimated Fair Value  
    (In thousands)  
 
Cash and cash equivalents
  $ 61,556     $ 61,556     $ 59,930     $ 59,930  
Revolving credit facility
    195,000       195,000       10,000       9,873  
2016 Notes
                332,665       341,813  
2018 Notes
    249,525       258,258       249,525       254,516  
2021 Notes
    360,000       354,600